/**
 * Copyright 2015 Sorcersoft.com S.A.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package sorcer.river;

import net.jini.lookup.ServiceDiscoveryEvent;
import net.jini.lookup.ServiceDiscoveryListener;
import net.jini.lookup.ServiceItemFilter;

/**
 * @author Rafał Krupiński
 */
public class FilteredServiceDiscoveryListener implements ServiceDiscoveryListener {
    final private ServiceDiscoveryListener listener;
    final private ServiceItemFilter filter;

    public FilteredServiceDiscoveryListener(ServiceDiscoveryListener listener, ServiceItemFilter filter) {
        this.listener = listener;
        this.filter = filter;
    }

    @Override
    public void serviceAdded(ServiceDiscoveryEvent event) {
        if (filter.check(event.getPostEventServiceItem()))
            listener.serviceAdded(event);
    }

    @Override
    public void serviceRemoved(ServiceDiscoveryEvent event) {
        if (filter.check(event.getPreEventServiceItem()))
            listener.serviceRemoved(event);
    }

    @Override
    public void serviceChanged(ServiceDiscoveryEvent event) {
        if (filter.check(event.getPreEventServiceItem())
                || filter.check(event.getPostEventServiceItem()))
            listener.serviceChanged(event);
    }
}
